8.14.3 Can you answer these questions?

8.14.3.1 Dimension too large dblfnote

https://tex.stackexchange.com/landing/r/digest?cta=question&id=635438

I am trying to compile a document (with XeLatex) contaning extremely long footnotes. 
It would be interesting to me to have double-column footnotes. 
When I try to use dbflnote package, I encounter a ... 
[footnotes] [dimensions]
 

asked by rsomebodyinparis https://tex.stackexchange.com/landing/r/digest?cta=user&id=264442 Score of 1

answered by rsomebodyinparis https://tex.stackexchange.com/landing/r/digest?cta=user&id=264442 Score of 0

8.14.3.2 Custom section style and corresponding starred command

https://tex.stackexchange.com/landing/r/digest?cta=question&id=634903

I need to use a custom format for a conference paper. I am asked to redefine the section, subsection and paragraph headings by the following code in the preamble: 
\documentclass[a4paper,10pt,twocolumn]... 
[sectioning] [starred-version]
 

asked by ggenovese https://tex.stackexchange.com/landing/r/digest?cta=user&id=264160 Score of 1

8.14.3.3 The characters are out of the form and it reminds me that "Overfull \vbox (16.44144pt too high)", I don't know why

https://tex.stackexchange.com/landing/r/digest?cta=question&id=635196

I'm curious about a mistake that I have made. I wrote like this: 
\documentclass{ctexart} 
\usepackage{multirow,makecell} 
\begin{document} 
\begin{table}[!htbp] 
\begin{tabular}{|c|r|} 
\hline 
\... 
[tables] [multirow] [makecell]
 

asked by jiawei chen https://tex.stackexchange.com/landing/r/digest?cta=user&id=264327 Score of 1

answered by F'x https://tex.stackexchange.com/landing/r/digest?cta=user&id=3734 Score of 0